.unslider-wrap {
    position: relative;
}

.unslider-wrap li {
    position: absolute;
    /* 其他样式... */
    opacity: 0;
    transition: opacity 0.5s ease-in-out;
}

.unslider-wrap .unslider-active {
    opacity: 1;
}

.unslider-nav li {
    /* 导航点样式 */
    cursor: pointer;
}